CVE-2025-40926

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Source
https://cve.org/CVERecord?id=CVE-2025-40926
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40926.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-40926
Published
2026-03-05T01:24:34.151Z
Modified
2026-07-15T01:48:58.859298271Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely
Details

Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely.

The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.

Predictable session ids could allow an attacker to gain access to systems.

Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.

Database specific 
{
    "cwe_ids": [
        "CWE-338",
        "CWE-340"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40926.json",
    "cna_assigner": "CPANSec"
}
References

Affected packages

Git / github.com/kazeburo/plack-middleware-session-simple

Affected ranges

Type
GIT
Repo
https://github.com/kazeburo/plack-middleware-session-simple
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f28768ed1d4f3b758bd43f2fd01d26f748b1c88d
Fixed
760bb358b8f53e52cf415888a4ac858fd99bb24e
Database specific 
{
    "cpe": "cpe:2.3:a:kazeburo:plack\\:\\:middleware\\:\\:session\\:\\:simple:*:*:*:*:*:perl:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.05"
        }
    ]
}

Affected versions

0.*
0.01
0.02
0.03
0.04

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40926.json"